Diablo DSP2930-S9 Speed Demon Spade Bit SetDiablo's Speed Demon spade bit range provides one of the fastest, most effortless hole drilling solutions on the market for fast, clean wood. Highlights: 9 Piece Set consist of 1 each 1 4 inch , 3 8 inch, 1 2 inch, 9 16 inch, 5 8 inch, 11 16 inch, 3 4 inch, 7 8 inch and 1 inch spade bits The high performance speed tip design self feeds for faster hole making when compared to traditional spade bits An optimized curved paddle design enhances the chip